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Bottom-up and top-down processes interact to modify intraguild interactions in resource-pulse environments.

Aaron C Greenville1, Glenda M Wardle, Bobby Tamayo

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Top predators like dingoes control smaller predators, benefiting prey populations. This predator-prey dynamic is strongest when prey numbers are low, offering crucial protection during resource scarcity.

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Area of Science:

  • Ecology
  • Wildlife Conservation
  • Predator-Prey Dynamics

Background:

  • Global decline of apex predators leads to mesopredator release.
  • Environmental resource availability influences predator populations and interactions.
  • Understanding these dynamics is crucial for biodiversity conservation.

Purpose of the Study:

  • To present a conceptual framework for predator regulation with resource pulses.
  • To investigate spatial and temporal interactions between dingoes, foxes, and cats.
  • To assess predator-prey relationships during varying prey abundance.

Main Methods:

  • Developed a conceptual framework for top-down and bottom-up regulation.
  • Utilized 2 years of remote-camera trapping data.
  • Analyzed interactions during prey population booms, declines, and busts.

Main Results:

  • Dingoes predictably suppress mesopredator populations (foxes and cats).
  • Suppression effects are most pronounced during prey declines and busts.
  • Resource pulses, driven by infrequent rains, influence these interactions.

Conclusions:

  • Apex predators like dingoes provide significant benefits to prey populations.
  • Dingoes offer protection by suppressing mesopredators during vulnerable low-prey periods.
  • This highlights the critical role of top predators in maintaining ecosystem stability.